advice please !

Stacy •
So I have been pumping since baby has been born . Yesterday, my mother ended up in the hospital and had to have surgery. And for the last two days I wasn't able to pump due to the circumstances. Now here I am pumping and I can't get more than an oz out of both breasts . Where I was getting about 2-3oz even 4 sometimes. Any advice will help? Why did it decrease ?